/// <summary>
/// Read the ENTITIES section of the DXF file.
/// </summary>
public void ReadEntities(CadDocument document)
{
//https://help.autodesk.com/view/OARX/2021/ENU/?guid=GUID-7D07C886-FD1D-4A0C-A7AB-B4D21F18E484
//Get the needed handler
m_reader = getSectionHandler(DxfFileToken.EntitiesSection);
//Advance to the first value in the section
m_reader.ReadNext();
//Loop until the section ends
while (!m_reader.EndSectionFound)
{
document.AddEntity(readEntity());
}
}
/// <summary>
/// Read the TABLES section of the DXF file.
/// </summary>
/// <param name="document">Document where the tables reside.</param>
public void ReadTables(CadDocument document)
{
if (document == null)
{
throw new ArgumentNullException(nameof(document));
}
//https://help.autodesk.com/view/OARX/2021/ENU/?guid=GUID-A9FD9590-C97B-4E41-9F26-BD82C34A4F9F
//Get the needed handler
m_reader = getSectionHandler(DxfFileToken.TablesSection);
//Advance to the first value in the section
m_reader.ReadNext();
//Loop until the section ends
while (!m_reader.EndSectionFound)
{
readTable(document);
if (m_reader.LastValueAsString == DxfFileToken.EndTable)
{
m_reader.ReadNext();
}
}
}
/// <summary>
/// Read the CLASSES section of the DXF file.
/// </summary>
/// <returns></returns>
public DxfClassCollection ReadClasses()
{
//Get the needed handler
m_reader = getSectionHandler(DxfFileToken.ClassesSection);
DxfClassCollection classes = new DxfClassCollection();
//Advance to the first value in the section
m_reader.ReadNext();
//Loop until the section ends
while (!m_reader.EndSectionFound)
{
if (m_reader.LastValueAsString == DxfFileToken.ClassEntry)
{
classes.Add(readClass());
}
else
{
m_reader.ReadNext();
}
}
return(classes);
}
/// <summary>
/// Read the HEADER section of the file.
/// </summary>
/// <returns></returns>
public CadHeader ReadHeader()
{
//Get the needed handler
m_reader = getSectionHandler(DxfFileToken.HeaderSection);
CadHeader header = new CadHeader();
Dictionary <string, DxfCode[]> headerMap = CadHeader.GetHeaderMap();
//Loop until the section ends
while (!m_reader.EndSectionFound)
{
//Get next key/value
m_reader.ReadNext();
//Get the current header variable
string currVar = m_reader.LastValueAsString;
if (!headerMap.TryGetValue(currVar, out var codes))
{
continue;
}
object[] parameters = new object[codes.Length];
for (int i = 0; i < codes.Length; i++)
{
m_reader.ReadNext();
parameters[i] = m_reader.LastValue;
}
//Set the header value by name
header.SetValue(currVar, parameters);
}
return(header);
}
/// <summary>
/// Read the BLOCKS section of the DXF file.
/// </summary>
public void ReadBlocks()
{
//Get the needed handler
m_reader = getSectionHandler(DxfFileToken.BlocksSection);
//Advance to the first value in the section
m_reader.ReadNext();
//Loop until the section ends
while (!m_reader.EndSectionFound)
{
//if (m_reader.LastValueAsString == DxfFileToken.ClassEntry)
// classes.Add(readBlock());
//else
// m_reader.ReadNext();
}
throw new NotImplementedException();
}
private DxfClass readClass()
{
DxfClass curr = new DxfClass();
Debug.Assert(m_reader.LastValueAsString == DxfFileToken.ClassEntry);
m_reader.ReadNext();
//Loop until the next class or the end of the section
while (m_reader.LastDxfCode != DxfCode.Start)
{
switch (m_reader.LastCode)
{
//Class DXF record name; always unique
case 1:
curr.DxfName = m_reader.LastValueAsString;
break;
//C++ class name. Used to bind with software that defines object class behavior; always unique
case 2:
curr.CppClassName = m_reader.LastValueAsString;
break;
//Application name. Posted in Alert box when a class definition listed in this section is not currently loaded
case 3:
curr.ApplicationName = m_reader.LastValueAsString;
break;
//Proxy capabilities flag.
case 90:
curr.ProxyFlags = (ProxyFlags)m_reader.LastValueAsShort;
break;
//Instance count for a custom class
case 91:
curr.InstanceCount = m_reader.LastValueAsInt;
break;
//Was-a-proxy flag. Set to 1 if class was not loaded when this DXF file was created, and 0 otherwise
case 280:
curr.WasAProxy = m_reader.LastValueAsBool;
break;
//Is - an - entity flag.
case 281:
curr.IsAnEntity = m_reader.LastValueAsBool;
break;
default:
break;
}
m_reader.ReadNext();
}
return(curr);
}